After running through standard testing (visual inspection, loose connections, corrosion and power at all the right points) and after going through the wiring diagram it was easy to see that the Door module was meant to apply ground to the different sides of the actuator and change its polarity in order to Lock or unlock the door. Once we tested the circuits for load carrying ability and the lock actuator with jumper cables (yes fused), we set our eyes on the door module. Once removed and opened we could see the carbonized contacts at the ground points inside. Very often ... Learn more at https://shop.curienllc.com/blogs/resources/what-is-voltage-drop
